What is the fastest way to create 28 x 28 x 28 individual cubes with its own material in python? Writing 3 forloops is too slow
Wrote this a while ago for 2.79b, takes 1 second for me (it is 20x20). It doesn't completely work in 2.8, but if you want it for that version you only have to adapt 1-2 lines.


import bpy
import numpy as np

np.set_printoptions(threshold=np.nan)

voxel_data = np.asarray([

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        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
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    ],
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        [0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0],
        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
        [0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0],
        [0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0],
        [0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0],
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        [0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0],
    ],
])

bpy.ops.object.delete(use_global=False)
bpy.ops.wm.addon_enable(module="add_mesh_extra_objects")

for x in range(voxel_data.shape[0]):
    for y in range(voxel_data.shape[1]):
        for z in range(voxel_data.shape[2]):

            if not (voxel_data[x, y, z] == 0):
                bpy.ops.mesh.primitive_vert_add()
                bpy.ops.transform.translate(value=(x * 2.1, y * 2.1, z * 2.1))

bpy.ops.object.mode_set(mode='OBJECT', toggle=False)
bpy.ops.object.origin_set(type='ORIGIN_GEOMETRY')

bpy.data.objects['Vert'].location[0] = 0.5
bpy.data.objects['Vert'].location[1] = 0.5
bpy.data.objects['Vert'].location[2] = 0.5

bpy.data.objects['Vert'].scale[0] = 0.5
bpy.data.objects['Vert'].scale[1] = 0.5
bpy.data.objects['Vert'].scale[2] = 0.5

bpy.ops.mesh.primitive_cube_add()

bpy.data.objects['Cube'].scale[0] = 0.5
bpy.data.objects['Cube'].scale[1] = 0.5
bpy.data.objects['Cube'].scale[2] = 0.5

bpy.context.scene.render.engine = 'CYCLES'
bpy.context.scene.render.engine = 'CYCLES'

bpy.data.objects['Vert'].dupli_type = 'VERTS'

bpy.data.objects['Cube'].select = True
bpy.data.objects['Vert'].select = True

bpy.context.scene.objects.active = bpy.data.objects['Vert']

bpy.ops.object.parent_set(type='OBJECT', keep_transform=False)